I too have my doubts about the mythical 600 dollar AR.
I'm sure they exist, I'm sure you can piece them together for that much or less. Can you take one home today, probably not. I see tons of 1000 dollar and up ones.
The mini14 you can take it out of the box and go shoot, or add a scope.
The ranch rifle can be turned into the tactical model later and save 100bucks right now.
I do feel that the tactical model should be called the "pro varminter" instead of tactical. The ranch would have benefitted greatly by having a threaded muzzle, my only real complaint.